JP3652450B2 - Passenger airbag - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an airbag for a passenger seat that protects a passenger in a passenger seat at the time of a vehicle collision, and in particular, an assistant that can simultaneously protect an occupant seated in a passenger seat from the upper body to the lower body without using a special shape. The present invention relates to a seat airbag.
[0002]
[Prior art]
An airbag for a passenger seat is provided with a passenger's head, chest, and knee, and a knee bag that protects from the upper body to the lower body.
Conventionally, as this type of airbag, one described in JP-A-8-72661 has been provided.
In this case, the airbag is composed of a main bag for protecting the upper body of the occupant and a sub bag for protecting the lower body. And the subbag is connected so that the first gas communication port may be formed at the periphery of the open surface of the retainer installed in the dashboard facing the seat of the passenger seat, A part of the main bag is fitted into the sub bag so as to be surrounded, and a partition panel that closes the end of the main bag is integrally sewn to a sewing portion that forms the first gas communication port of the sub bag. The main bag is sewn to the sub bag so that the second gas communication port is located in the bag.
According to this conventional example, the airbag has a special shape, and it is necessary to create two types of bag bodies, that is, a sub bag and a main bag. The sewing work is complicated, and there is a disadvantage that the cost of the airbag cannot be reduced.
[0003]
Moreover, what was described in Unexamined-Japanese-Patent No. 7-329685 is also provided as what simplified the structure.
This machine sews the outer edge of two base fabrics of different lengths, overlaps the middle part of the longer base fabric and extends outwards, and sews the sides of the extended part. A bulge is provided. When the airbag is inflated, the bulging portion functions as a knee bag to protect the occupant's knee.
[0004]
[Problems to be solved by the invention]
According to the one described in Japanese Patent Application Laid-Open No. 7-329685, the sewing of the extended portion and the sewing of the outer edge portion of the base fabric are different in the respective sewing surfaces, and therefore the sewing work must be performed in separate steps. The work efficiency is poor and it is difficult to automate sewing.
In addition, since the initial deployment direction of the airbag is different from the deployment direction of the bulging portion (knee bag), the knee bag is accurately guided and deployed in a slight gap from the dashboard where the airbag device is installed to the knee of the occupant. It also had the problem that it was very difficult.
[0005]
Accordingly, an object of the present invention is to provide an airbag for a passenger's seat that can reliably protect an occupant from the upper body to the lower body by performing very simple sewing. is there.
Further, in addition to the object of the invention described in claim 2, the invention described in claim 2 can easily enter this gap even if the distance from the knee to the dashboard varies depending on the body shape of the vehicle or the occupant. An object of the present invention is to provide an airbag for a passenger seat that can protect the knee of the passenger.
Furthermore, the invention described in claim 3 is intended to provide a passenger seat airbag having high energy absorption efficiency in addition to the objects of the invention described in claim 1 and claim 2. .
[0006]
[Means for Solving the Problems]
In order to achieve the above object, the invention according to claim 1 of the present invention is an airbag used in a passenger airbag device installed on the upper surface of a dashboard, and is disposed on the windshield side and opened. And a second base cloth disposed on the occupant side, and sewing an outer edge portion of the first base cloth and the second base cloth to form an upper sewing line and both side sewing lines. And the lower sewing line is formed, and when inflated and deployed, the vicinity of the upper sewing line is located at the top of the airbag and abuts against the windshield, and the lower sewing line comes to the bottom of the airbag and the dashboard. of located between the front and passenger's knee, the inclination angle substantially equal to the dashboard front portion side sewing line faces the occupant knee and Do Ri is characterized by functioning as a knee-bag .
[0007]
Here, the airbag is accommodated in an airbag device for a passenger seat, and the airbag device is disposed and fixed on the inner upper surface of the upper portion of the dashboard facing the passenger seat.
In the airbag, by sewing and reversing the outer edge portions of the first and second base fabrics having a substantially rectangular shape, an upper sewing line that wraps around the bag, a both-side sewing line, and A lower sewing line is formed.
The airbag is arranged so that the first base fabric faces the windshield side and the second base fabric faces the occupant side when inflated and deployed.
The opening formed in the first base fabric is for injecting the jet gas from the inflator into the airbag. The opening is provided so that the upper sewing line is positioned at the top when the airbag is inflated and deployed, and the vicinity of the upper sewing line is in contact with the windshield.
[0008]
The invention according to claim 2 is characterized in that the first base fabric and the second base fabric are partially sewn with a suture thread at a portion between the opening and the lower sewing line to form a partially stitched portion. It is said.
If a part of the seam is formed at the lower part of the airbag, the part that forms the part of the seam is inflated narrowly when the airbag is inflated and deployed, and it is ensured between the front of the dashboard and the occupant's knee. I can enter.
[0009]
The invention according to claim 3 is characterized in that a suture thread partially formed with a suture portion is cut when the airbag is inflated and deployed.
When the suture forming a part of the suture portion is cut during the inflation and deployment of the airbag, the airbag is located between the front portion of the dashboard and the knee portion of the occupant and is inflated.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
The airbag 20 according to the present invention is housed in an airbag device for a passenger seat, and the airbag device is disposed and fixed on the inner upper surface of the upper portion 11a of the dashboard 11 facing the passenger seat.
FIG. 1 is a cross-sectional view of the passenger seat airbag device attached to the top of the dashboard, and FIG. 2 is a rear view of the airbag.
[0011]
Reference numeral 12 denotes a housing of an airbag device that houses a folded airbag 20 and a cylindrical inflator 13 and is fitted into a storage space formed in the dashboard upper portion 11a.
An opening 14 is formed in the upper part of the housing 12.
And the housing 12 is arrange | positioned so that the upper part may incline to the passenger | crew 30 side.
[0012]
The opening 14 of the housing 12 is closed by a lid 15.
The lid 15 is formed with a groove-like fragile portion 15a having a reduced thickness so that the lid 15 can be easily broken when the inflator 13 is operated so that the airbag 20 can be quickly inflated and deployed.
The inflator 13 may be a hybrid type that uses a compressed gas mainly composed of argon and an explosive.
The inflator 13 is provided with a gas ejection port (not shown) for ejecting compressed gas, and the ejected gas flows into the airbag 20.
[0013]
Reference numeral 16 denotes a partition plate attached to the housing 12 by being interposed between the inflator 13 in the housing 12 and the airbag 20. A gas discharge port 17 is formed in the partition plate 16 so that the gas ejected from the inflator 13 is diffused and supplied into the airbag 20.
Reference numeral 18 denotes a bag fixing plate for holding the airbag 20 between the partition plate 16.
Reference numeral 19 denotes a windshield.
[0014]
The airbag 20 is composed of two base fabrics, a first base fabric 21 and a second base fabric 22 that have a substantially square shape.
As the first base fabric 21 and the second base fabric 22, a woven fabric coated with rubber or synthetic resin may be used, or a simple woven fabric may be used.
The first base fabric 21 is formed with an opening 23 for allowing the gas ejected from the inflator 13 to flow into the airbag 20.
[0015]
The airbag 20 is manufactured by superimposing the first base fabric 21 and the second base fabric 22 on top and bottom, sewing the outer edge portions thereof, and then inverting the first base fabric 21 from the opening 23 provided in the first base fabric 21. is there.
In the airbag 20, an upper sewing line 24, both side sewing lines 25 and 25, and a lower sewing line 26 that make a round of the bag are formed at sewing locations.
[0016]
The airbag 20 is sandwiched and fixed to the housing 12 by the partition plate 16 and the bag fixing plate 18 so that the opening 23 of the first base fabric 21 faces the gas discharge port 17 of the partition plate 16. It is attached.
The airbag 20 is arranged so that the first base fabric 21 faces the windshield 19 side and the second base fabric 22 faces the occupant 30 side when inflated and deployed.
[0017]
The airbag 20 is provided so that the upper sewing line 24 is positioned at the uppermost position and the vicinity of the upper sewing line 24 is in contact with the windshield 19 when the airbag 20 is inflated and deployed (the state shown in FIG. 12).
The position where this upper sewing line 24 comes to the top is the first base fabric 21 so that the inclination angle of the front portion 11b of the dashboard 11 facing the occupant 30 and the portion where the windshield 19 intersects the vicinity. The length of the upper sewing line 24 is set from the opening 23.
[0018]
When the position of the opening 23 is set in this manner, when the airbag 20 is inflated and deployed, the upper sewing line 24 is positioned at the uppermost position, the upper portion of the first base fabric 21 is in contact with the windshield 19, and the lower sewing line is set. 26 comes to the lowermost part of the airbag 20 and is located in the vicinity of the dashboard front part 11b, and the side sewing line 25 is substantially equal to the inclination angle of the dashboard front part 11b and is substantially parallel to the inclination angle. It becomes a state.
[0019]
In the lower part of the airbag 20, that is, at a portion between the opening 23 and the lower sewing line 26, a first stitched portion 27, in which a first base fabric 21 and a second base fabric 22 are partially sewn with a suture thread. May be formed.
When a partly stitched portion 27 is provided at the lower part of the airbag 20, when the airbag 20 is inflated and deployed, a portion where the partly stitched portion 27 is formed is inflated narrowly, and the dashboard front portion 11 b and the knee portion of the occupant 30 are inflated. Even if the space is narrow, the airbag 20 can be reliably inserted into the gap.
The lower part of the airbag 20 functions as a knee bag.
[0020]
3 is formed by partially sewing the first base fabric 21 and the second base fabric 22 in the lower part of the opening 23 of the airbag 20 in parallel with the lower sewing line 26. As shown in FIG. It is.
4 partially stitches the first base fabric 21 and the second base fabric 22 in two rows parallel to the lower sewing line 26 at the lower portion of the opening 23 of the airbag 20. Is formed.
[0021]
The partially stitched portion 27 shown in FIG. 5 is formed by partially stitching the first base fabric 21 and the second base fabric 22 in a reverse C shape at the bottom of the opening 23 of the airbag 20. .
A partially stitched portion 27 shown in FIG. 6 is formed by partially sewing the first base fabric 21 and the second base fabric 22 in a letter C shape below the opening 23 of the airbag 20.
The partially stitched portion 27 is not limited to these shapes, and may be formed in a shape in which the lower portion of the airbag 20 is partially inflated.
[0022]
The suture that forms part of the suture portion 27 may be configured to be cut by the inflation pressure of the airbag 20 when the airbag 20 is inflated and deployed (immediately after deployment).
When the suture thread is cut, the airbag 20 enters and inflates between the dashboard front portion 11b and the knee portion of the occupant 30, so that the shock absorbing performance can be improved.
[0023]
7 to 12 show the process of inflating and deploying the airbag 20.
When the vehicle collides, the compressed gas ejected by the operation of the inflator 13 passes through the gas discharge port 17 of the partition plate 16 and is supplied into the airbag 20 from the opening 23.
The fragile portion 15a is broken by the pressure of the airbag 20, the lid 15 is opened, and the airbag 20 is inflated and deployed.
[0024]
At the initial stage of inflation and deployment of the airbag 20, the airbag 20 is gradually inflated along the windshield 19 as shown in FIGS. 7 and 8.
When the airbag 20 is fully inflated to the upper sewing line 24, the airbag 20 is replaced with the windshield 19 in the vicinity of the upper sewing line 24, and when the pressure further increases, as shown in FIG. Expands and expands toward the passenger 30 side.
At this time, since the second base fabric 22 facing the occupant 30 side does not come into contact with the vehicle interior parts or the like, the gas pressure from the inflator 13 is uniformly applied to the second base fabric 22, so that the sewing line is a straight line. It extends into a shape.
[0025]
10 and 11, the lower part of the airbag 20 is lowered and inflated and deployed, enters between the dashboard front part 11b and the knee part of the occupant 30, and functions as a knee bag.
When the airbag 20 is inflated and deployed, as shown in FIG. 12, the upper sewing line 24 of the airbag 20 is positioned at the uppermost position, the lower sewing line 26 is positioned at the lowermost position, and the side sewing line 25 is positioned at the front of the dashboard. It becomes a state substantially parallel to the inclination of 11b.
[0026]
【The invention's effect】
As described above, the invention according to claim 1 of the present invention has a simple structure of the airbag, does not require a special member, and only uses the replacement of the upper windshield of the airbag. The occupant can be reliably protected from the upper body to the lower body.
In addition, since the conventional airbag swings when the airbag is inflated, the occupant cannot be protected unless the airbag is made larger than necessary. Since the swinging is restrained by being supported by the board, the occupant protection performance can be improved without excessively increasing the airbag.
[0027]
In the invention according to claim 2, although the distance from the knee to the dashboard differs depending on the body shape of the vehicle and the occupant, by forming a part of the stitched portion, it can easily enter even if this gap is small and surely The passenger's knee can be protected.
Furthermore, the invention according to claim 3 can fill the space between the occupant's knee and the dashboard by cutting the suture that partially formed the suture when the airbag is inflated and deployed. High energy absorption efficiency.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a state in which a passenger seat airbag device containing an airbag according to the present invention is attached to an upper portion of a dashboard.
FIG. 2 is a rear view of the airbag.
3A and 3B are views showing an airbag according to a second embodiment, in which FIG. 3A is a rear view, and FIG. 3B is a side view in an inflated state.
4A and 4B are views showing an airbag according to a third embodiment, wherein FIG. 4A is a rear view, and FIG. 4B is a side view in an inflated state.
5A and 5B are views showing an airbag according to a fourth embodiment, wherein FIG. 5A is a rear view, and FIG. 5B is a side view in an inflated state.
6A and 6B are views showing an airbag according to a fifth embodiment, wherein FIG. 6A is a rear view, FIG. 6B is a side view in an expanded state, and FIG. 6C is a side view in a state in which a suture is cut. .
FIG. 7 is an explanatory view showing an inflating and deploying process (initial stage of inflating and deploying) an airbag.
FIG. 8 is an explanatory view showing an inflating and deploying process of the airbag.
FIG. 9 is an explanatory view showing an inflating and deploying process of the airbag.
FIG. 10 is an explanatory view showing an inflating and deploying process of the airbag.
FIG. 11 is an explanatory view showing an inflating and deploying process of the airbag.
FIG. 12 is an explanatory view showing an inflating and deploying process (when inflating and deploying) of the airbag.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 11 Dashboard 11a Dashboard upper part 11b Dashboard front part 19 Windshield 20 Air bag 21 1st base fabric 22 2nd base fabric 23 Opening 24 Upper sewing line 25 Side sewing line 26 Lower sewing line 27 Partial sewing part 30 Crew

Claims (3)

An airbag used in a passenger airbag device installed on an upper surface of a dashboard,
A first base fabric disposed on the windshield side and having an opening; and a second base fabric disposed on the passenger side;
The outer edge portion of the first base fabric and the second base fabric is sewn to form an upper sewing line, both side sewing lines, and a lower sewing line,
During inflation and deployment, the vicinity of the upper sewing line is positioned at the top of the airbag and abuts against the windshield, and the lower sewing line is at the bottom of the airbag and between the front of the dashboard and the knee of the passenger position, and Ri Do an inclination angle substantially equal to the dashboard front portion side sewing line faces the occupant knee, passenger airbag, characterized in that function as kneebag in.   The assistant according to claim 1, wherein the first base fabric and the second base fabric are partially stitched with a suture thread at a portion between the opening and the lower sewing line to form a partially stitched portion. Seat airbag.   3. The airbag for a passenger seat according to claim 2, wherein a suture thread partially formed with a stitched portion is cut when the airbag is inflated and deployed.

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